1 # SPDX-License-Identifier: GPL-2.0
2 hostprogs-y := vdsomunge
4 obj-vdso := vgettimeofday.o datapage.o
7 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
8 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
10 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
11 ccflags-y += -DDISABLE_BRANCH_PROFILING
13 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
14 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
15 -z max-page-size=4096 -nostdlib -shared $(ldflags-y) \
16 $(call ld-option, --hash-style=sysv) \
17 $(call ld-option, --build-id) \
20 obj-$(CONFIG_VDSO) += vdso.o
21 extra-$(CONFIG_VDSO) += vdso.lds
22 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
24 CFLAGS_REMOVE_vdso.o = -pg
26 # Force -O2 to avoid libgcc dependencies
27 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
28 CFLAGS_vgettimeofday.o = -O2
30 # Disable gcov profiling for VDSO code
33 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
37 $(obj)/vdso.o : $(obj)/vdso.so
39 # Link rule for the .so file
40 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
43 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
44 $(call if_changed,vdsomunge)
46 # Strip rule for the .so file
47 $(obj)/%.so: OBJCOPYFLAGS := -S
48 $(obj)/%.so: $(obj)/%.so.dbg FORCE
49 $(call if_changed,objcopy)
51 quiet_cmd_vdsomunge = MUNGE $@
52 cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
55 # Install the unstripped copy of vdso.so.dbg. If our toolchain
56 # supports build-id, install .build-id links as well.
58 # Cribbed from arch/x86/vdso/Makefile.
60 quiet_cmd_vdso_install = INSTALL $<
61 define cmd_vdso_install
62 cp $< "$(MODLIB)/vdso/vdso.so"; \
63 if readelf -n $< | grep -q 'Build ID'; then \
64 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
65 first=`echo $$buildid | cut -b-2`; \
66 last=`echo $$buildid | cut -b3-`; \
67 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
68 ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
73 @mkdir -p $(MODLIB)/vdso
76 vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
77 $(call cmd,vdso_install)